Westby Montana Climate Data

Monthly Average Climate Data for Westby Montana

Switch Data to Celsius/Metric Units
MonthAvg. LowAvg. HighAvg. Precip
January-0.6 °F18.8 °F0.45 in.
February3.6 °F23.6 °F0.32 in.
March15.2 °F35.5 °F0.57 in.
April27.8 °F52.4 °F0.9 in.
May39.6 °F64.7 °F1.88 in.
June49.9 °F72.8 °F3.28 in.
July54.4 °F79.8 °F2.46 in.
August52.3 °F80.2 °F1.54 in.
September42.1 °F69.7 °F1.26 in.
October29.8 °F53.7 °F0.89 in.
November16.4 °F35.5 °F0.5 in.
December4.9 °F23.4 °F0.46 in.
Annual28 °F50.8 °F14.51 in.

Climate Data for Westby Montana

Average First Frost DateSep.11 - Sep. 20
Average Last Frost DateJun. 1 - Jun. 10
Average Days With FrostOver 180 Days
Plant Hardiness Zone - 2023Zone 3b : -35°F to -30°F
Plant Hardiness Zone - 2012Zone 3b : -35°F to -30°F
Current Drought ConditionsAbnormally Dry
Köppen Climate ClassificationBSk - Cold Semi-Arid Climate
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